I don't understand why she was trying to make me jealous when we just met?

Yeahhbro
We have only talked a couple of time and I seriously don't understand her, why would she make me jealous when we barely know each other?.

Well I picked her up in my geography class and she seemed interested, trust me.

Then the second time she was completely different, she was pretty cold and a little bit "shy" but mostly really cold to the point that I got the cold shoulder and utterly ignored . Then (this is the crucial part of my question) some guy came and then she just threw herself to him and hug him tightly, I know she wanted to make me jealous or at least tell me to f*** off; funny how the guy looked so surprised after what she did, he probably didn't expect anything like that.

Well there is something that I can't stand and its jealousy, I am not jealous person but I know she wanted to make me jealous. I don't understand why so fast though, I understand playing hard to get and all of that, but making someone jealous on purpose, is that really necessary?. I was OK MAYBE later but so early?. That gave me such a bad impression of her, that I actually don't like her anymore.

What do you think?
I don't understand why she was trying to make me jealous when we just met?
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